Microfluidic Amplification Chamber with Opaque Control Zone
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current microfluidic systems face challenges in distinguishing between amplification reactions of target and internal control sequences without splitting the sample, especially when using non-specific detection methods, leading to potential false negatives due to inhibitor sensitivity and compatibility issues.
Innovation Solution
A microfluidic system with an amplification chamber featuring a recess for internal control compounds, where the control reaction is spatially and temporally separated from the optical detection zone, allowing for simultaneous analysis without sample division, using a multilayer architecture with transparent and opaque zones to differentiate between target and control amplifications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the internal control compound is placed in the same reaction zone as the target sequence, then the entire sample can be tested simultaneously, but non-specific detection methods cannot be used and false negatives may occur due to inability to discriminate between reactions
Solution Approach 1:
The amplification chamber is divided into two distinct zones: a first zone for target sequence amplification that is transparent to optical signals, and a second zone for internal control compound amplification that is opaque to optical signals. This spatial segmentation allows both reactions to proceed simultaneously while enabling clear discrimination between target and control amplifications through optical detection methods.
2Adaptability or versatility
If the sample is split into separate reactions for target and control analysis, then any amplification detection technique can be used for the control, but sensitivity and representativeness of the test are reduced
Solution Approach 1:
The system merges the target analysis and internal control analysis into a single amplification chamber, allowing both reactions to occur in the same sample volume simultaneously. The optical detection system can distinguish between the two reactions based on the transparency/opacity properties of each zone, thereby maintaining full sample utilization while enabling versatile detection techniques including non-specific intercalating agents and colorimetry.
3Measurement precision
If a multilayer architecture with opaque portions is used to separate control and target zones, then reliable discrimination between amplifications is achieved, but device complexity increases
Solution Approach 1:
The amplification chamber employs local quality differentiation where specific regions (first zone and second zone) have distinct optical properties - the first zone is transparent to allow optical detection of target amplification, while the second zone contains opaque portions that prevent optical signal passage for the control reaction. This localized property assignment enables reliable discrimination without requiring complex overall device architecture.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables reliable discrimination between target and internal control amplifications, reducing false negatives and maintaining sample integrity, while being compatible with various detection techniques, including non-specific intercalating agents and colorimetry.
Implementation Method 1
The second zone has at least one opaque portion configured not to allow said optical signal to pass through
Data Source
AI summary
A microfluidic system is intended for the analysis of a biological sample containing biological species. The system includes an optical detection device having a source configured to emit an optical signal and at least one sensor having a capture surface defining an optical signal reading zone. The system also includes a microfluidic device having a support in which an amplification chamber, in which an amplification reaction can be carried out, is made, and having an input channel opening into the amplification chamber. The amplification chamber includes at least one first zone located in the sensor reading zone and at least one protuberance forming a recess intended to receive a compound for internal control of the amplification reaction and arranged to be located outside the sensor reading zone or configured to be opaque to said optical signal.